.content {
    width: 700px;
    height: 800px;
    margin: auto;
}

#top {
    width: 700px;
    height: 150px;
    background-color: red;
}

#left {
    width: 178px;
    height: 600px;
    background-color: yellow;
    float: left;
    margin-top: 2px;
    border-radius: 10px;
}

#right {
    width: 518px;
    height: 600px;
    background-color: green;
    float: left;
    margin-top: 2px;
    margin-left: 2px;
    border-radius: 10px;
}